audio/linuxwave: unbreak build after b2b39062

/wrkdirs/usr/ports/audio/linuxwave/work/linuxwave-0.1.5/build.zig:44:33: error: no field named 'path' in union 'Build.LazyPath'
/usr/local/lib/zig/std/Build.zig:2171:22: note: union declared here

PR:		279604